e subjected by being car- bell, and also as a means of notifying the inmates when the Fig. 2. It will be seen that if the door is then opened the ried about and the consequent passage of them from hand to burglar attempts to unlawfully enter. Fig. 1 represents the hand. The authority we quote… … The Prussian Patent Lair. a plate of metal to be secured to the inside of the door. The In our last number we discussed the defects of the Prussian bell—the ordinary gong-shaped bell—is screwed on the cen- patent system, and intimated that measures were in progress to ter spindle, B. C is a cam…
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